RecruitingDrug trialNovel Biomarkers of Non-IgE Immediate Hypersensitivity Drug ReactionsThe goal of this clinical trial is to investigate biomarkers of non-IgE-mediated immediate hypersensitivity reactions during infusion of intravenous vancomycin. The main question it aims to answer is: • Identifying novel biomarkers in blood that occur during infusion reaction Participants will: * Have allergy skin testing for vancomycin * Receive an infusion of vancomycin